Vacuum cleaner



R. c. LAMPE 2,682,317

VACUUM CLEANER June 29, 1954 Filed Jan. 15, 1953 9 Sheets-Sheet l INVEN TOR 4%5597 547M;

M4 ATTORNEY R. C. LAMPE VACUUM CLEANER June 29, 1954 9 Sheets-Sheet 2 Filed Jan. 15, 1953 INVENTOR /%6E Pr 81mm;

//'4 ATTORNEY R. C. LAMPE VACUUM CLEANER June 29, 1954 9 Sheets-Sheet 3 Filed Jan. 15, 1953 INVENTOR fiaEERT C. ZAMAE.

,6: M A664 ATTORNEX.

R. C. LAMPE VACUUM CLEANER June 29, 1954 9 Sheets-Sheet.4

Filed Jan. 15, 1953 O O O O O O O O O O O O O O O O INVENTOR F055;?- 6? 4402 5 2 N BY/ R. C. LAMPE VACUUM CLEANER June 29, 1954 9 Sheets-Sheet 5 Filed Jan. 15, 1953 o m w 0 1. mm 2 2 2 3 h 0 I 5 42 3 x 2. 2 7 9 0 9 & 8 6 M 9 "M 5 9 26 9 6 8 l 1 INVENTOR @5527 d Ayn By ATTORNEY.

June 29, 1954 R. c. LAMPE VACUUM CLEANER Filed Jan. 15, 1953 9 Sheets-Sheet 6 INVENTOR @5597 (5 [MM/J5.

Bli 4/3/% a;- ATTORNEY.

R. C. LAMPE VACUUM CLEANER June 29, 1954 9 SheetsSheet 8 Filed Jan. 15, 1955 Sm Qw/ O 0 8% a) O O 090 8% ivwm 96 N3 0% Rm fl -ATTORNEK R. C. LAMPE VACUUM CLEANER June 29, 1954 9 Sheets-Sheet 9 Filed Jan. 15, 1953 INVENTOR fiafiifi? 6. Z 1444/05 ih-ATTORNEK Patented June 29, 1954 VACUUM CLEANER Robert C. Lampe, Stamford, Conn, assignor to Electrolux Corporation, Old Greenwich, Conn., a corporation of Delaware Application January 15, 1953, Serial No. 331,402

This application is a continuation-in-part of co-pending application Serial No. 140,394 filed jointly by Gustaf Einar Lofgren, John T. Ferraris and myself on January 25, 1950, now Patent No. 2,641,330 issued June 9, 1953, and relates back thereto for all common subject matter.

The present invention relates to vacuum cleaners of the enclosed bag type and more particularly to such vacuum cleaners provided with means for automatically ejecting the dust bag. A cleaner of this kind advantageously is designed to use a disposable dust bag, a preferred type of which includes a bag portion made of pervious paper secured, as by gluing, to a disc portion of relatively stiff cardboard. For economy of manufacture on more or less standard paper bag machines, as well as for other reasons, the bag is of the type which has a rectangular crosssection when in extended condition, but which may be collapsed to a flat condition in order to save space during storage. When such a bag is first placed in a vacuum cleaner it is normally in a substantially collapsed condition, in which its overall length is greater than when the bag is subsequently expanded by the introduction thereinto of dirt coupled with the inflating action of the air. For the purpose of ejecting the bag from the cleaner through an opening in the housing forming the dust bag compartment, a movable ejector plate is provided which, when ejection is to take place, moves through the bag compartment towards the opening, pushing the dust bag ahead of it.

When in retracted position, this ejector plate should be spaced far enough from the opening so that the partially collapsed bag when first inserted will not be crumpled up by its inner closed end contacting the plate. On the other hand, when the bag is foreshortened by being inflated, the inner closed end thereof should be supported by the plate in order to relieve strain on the glued joint between the bag portion and the disc.

In accordance with my invention I provide an ejector plate which is so curved or otherwise formed that the lower portion thereof is disposed further from. the opening than is the upper portion. Thus, the inner end of the bag, when the latter is in its initial collapsed and lengthened condition, will lie on the bottom of the dust bag compartment and extend into the recess or pocket formed in the lower part of the curved ejector plate. On the other hand, when the bag is extended laterally and foreshortened by inflation, the inner end of the bag will contact the upper 11 Claims. (Cl. 183-62) portion of the ejector plate inasmuch as the latter is disposed closer to the opening than is the lower part. This configuration of the ejector plate also provides space behind the upper part which advantageously may be employed to accommodate the mechanism required for moving the plate.

Still other and further objects will be disclosed hereinbelow or will become evident to those skilled in the art after a careful study of the following description together with the appended drawings wherein:

Figure 1 is a perspective view of a portion of the cleaner and hose showing the cover open, the ejector plate forward and the dust-filled bag in ejected position just prior to its coming to rest on the floor;

Figure 2 is a vertical sectional view taken on the line 2-2 of Fig. 5;

Figure 3 is a horizontal sectional view taken on the line 33 of Fig. 5;

' Figure 4 is a partial horizontal sectional View similar to Fig. 3, but showing the cover opened and the scissors ejector mechanism fully distended;

Figure 5 is a front plan view of the vacuum cleaner;

Figure 6 is a vertical sectional View taken on the line 6-6 of Fig. 5 showing the parallel linkage of the hose coupling assembly to the cover;

Figure '7 is a sectional view taken on the line 'i-l of Fig. 5, showing the manually operable button for releasing the front cover;

Figure 8 is a sectional view taken on the line 88 of Fig. 5 showing the manually operable switch actuating button for energizing and deenergizing the motor fan unit;

Figure 9 is a horizontal sectional view taken on the line 99 of Fig. 5 showing the linkage control for automatically releasing the dust bag ejector device;

Figure 10 is a wiring diagram including some of the pneumatic controls; and

Figure 11 is an exploded perspective View with portions cut away in section showing the electro-pneumatic control unit and details of its internal construction.

Referring now more particularly to the drawings, vacuum cleaner housing i0 is a hollow casing having a handle II. It is appropriately supported on a pair of runners 2. The suction or inlet portion of the casing I0 is provided with an air inlet nozzle and wand (not shown) together with a suitable flexible hose 13, Fig. l, and connecting coupling Ma fitted into a movable hose coupling assembly I5 mounted on cover I6. Cover I6, Fig. 4, hinged at Il to front body rin 20 and biased to open position by spring i8, effects with casing I an air tight seal formed by rubber sealing ring member I9, cardboard disc of dust bag 30 and sealing ring 22 positioned in the bag insertion opening of front body ring 25, Fig. 3. Tubular member 2| of the hose coupling assembly I5 extends through the opening 32 cut in cardboard disc 3| well into the dust collecting receptacle 30, and is sealed against disc 3| by rubber sealing ring l9. Switch button 60 on cover I5 provides the on-and-off manual control for the cleaner unit.

A perforated sleeve 23 is affixed at one end to front body ring and is adapted for supporting dust bag 33 (of disposable paper or cloth construction). This entire unit "(sleeve 23, body ring 20, etc.) is slidably fitted within the open end of cleaner housing It and is afixed thereto by retaining screws 24, Figs. 1, 2, and 6. In the embodiment shown, sleeve 23, reinforced by lateral stiffening plates 25 and base rods 25, is substantially rectangular in cross-section and is thus adapted to take a bag 39 of substantially similar but slightly smaller cross-section, Figs. 1, 2 and 3.

Dust bag 33, Fig. 1, comprises a dust receptacle of paper or similarly air-pervious, dust-impervious, material. 33 affixed at its mouth, as by gluing, to the rear surface of a hard paper or cardboard disc 3|, the latter being clamped between rubber sealing ring I9 of hose coupling assembly I5 and the open end of front body ring 2| with the aid of sealing ring 22. Cardboard disc 3| has a central opening 32 through which tubular member 2| is inserted in order to introduce the air and entrained dust directly into the interior of dust bag 30.

The entire inner surface of perforated sleeve member or dust bag receiving compartment 23 is provided with apertures 27, Figs. 2 and 4, in order to permit suction air current to pass freely therethrough and into chamber Ml, the air also passing to compartment containing the ejector scissors '53 and its associated expulsion spring assembly 5I. Thereafter the suction air current passes through motor fan compartment I0 which contains mounted therein fan TI and motor I2. The fan is provided with an air inlet I3 through which the air passes to the housing of motor I2 and out through louver openings I4.

The scissors ejector mechanism 5|, 53, Figs. 2, 3 and 4, for operating the bag ejector plate 52 is in the form of a collapsible spring loaded lazy tongs 53 which can be collapsed into fully flexed (loaded) condition, Fig. 3, by pushing back ejector plate 52 hingedly attached by pins to the front pair of scissors blades 53a. Mutually inter meshing gear teeth 54 cut in coacting portions of the front pair of scissors blades keep plate 52 oriented correctly throughout the extent of its travel. Li-shaped frame member 55 aifixed to the rear end of perforated sleeve 23 supports the ends of the rear pair of scissors blades 530 by holding the latter between a pair of sleeves 56, all

panded, but is in the semi-collapsed condition shown in broken lines in Fig. 2. In this condition the length of the bag is greater than it is when the bag becomes more fully expanded by the accumulation of dirt therein, as shown in full lines. The distance between the opening in ring 25 and the lower part I53 of member 52 is slightly greater than the maximum length ofthe bag when in semi-collapsed condition, so that the bag may be inserted in this condition without being crumpled. If the entire vertical portion .I 5I were in the same plane as the upper part I52 thereof, the resulting crumpling of the bag would be apt to cause it to become folded against the inner end of tubular inlet member 2|, thus interfe'ri'n'g with the flow of air when the fan of the cleaner is started. Inasmuch as the automatic ejection of the bag is caused by a difference between the pressure existing in the inlet conduit 2| and the pressure outside the bag, as will be explained hereinafter, such interference with flow would be apt to create a sufiicient pressure difference to immediately cause ejection before any dirt whatsoever were introduced into the bag. The possibility of this occurrence is completely eliminated by having the lower part I53 disposed as described.

On the other hand, if the entire vertical portion |5| were in the same plane as the lower part I53, the dust bag when in expanded condition, as shown by the full lines in Fig. 2, would be spaced therefrom and consequently the closed inner end of the bag would not be supported. Such support is highly desirable, inasmuch as the pressure drop through a dirt filled bag results in the exertion of a substantial force which, if not transferred from the bag portion 33 to the ejector plate 52, would be transferred to the cardboard disc 3| and, in many cases, would be sufficient to rupture the glued joint between the bag portion and the disc.

By making the ejector plate in the manner above described, support is provided for the bag when in expanded condition, While at the same time there is sufficient space for the bag in partially collapsed condition. Also, this construction provides space behind the upper art I52 for accommodating the ejector actuating mechanism.

The scissors ejector mechanism 5|, 53, is held in spring loaded position by a depending lug 6|, Fig. 2, which is integral with plate 52 and engages, sequentially, front latch 62 and rear latch 63 when plate 52 is pushed to its most rearwardly or spring loaded position, Fig. 3. Front latch 52 together with sleeve 54 and lever 66, Fig. 9, forms a bell crank biased to latching position by spring 68 while rear latch 53 together with pin and bell crank 61, Fig. 9, forms another com osite bell crank biased to latching position by spring 69.

The above latches for restraining the ejector mechanism are operated through appropriate linkages. Thus rear latch 53 is moved to releasing position by automatic triggering initiated by pneumatically actuated means (described below) and transmitted through link BI, and a bell crank formed of lever arm 83, pin and lever arm 81, Fig. 9, while lever arm 81 is actuated in turn by bell crank '89, Figs. 2, 6 and 9, fulcrumed at Si and linked directly to the pneumatically operated triggering device 250.

Front latch 62 is moved to releasing position by the final opening stages of the released front cover I5 through link 82, and a bell crank form of lever arm 84, pin 86, and lever arm 88, while 5 the latter is actuated by slide or draw bar 92 which is pulled outwardly by a cam 94 on the parallel linkage H5 of the hose coupling assembly I5.

With this particular latching device for restraining the scissors ejector mechanism 5l, plate 52 is held in loaded position until cover It is practically fully opened. Cover It is normally held closed by latch Hill, Figs. 1 and 7, fulcrumed at NH and biased to retain cover It in closed position by tension spring I92.

The cover may be opened for inspection of the bag and its contents, however, without necessarily ejecting the dust bag, by pressing release button lfib on cover It downwards and (Fig. '7) causing plunger I05 held through elongated slot I06 by retaining screw I and biased upwards by spring I 98 to contact latch I00. Pressing button I6b forces plunger 15 downwards against latch I90 thus releasing cover I6. Then, even with front latch 62 released by the opening of cover It to its full extent, rear latch 63 restrains scissors ejector 53 from discharging the dust bag. Latch 53 thus serves as an auxiliary safety latch preventingthe dust bag in either full or empty condition from being ejected upon manually opening cover It. On the other hand, with cover [9 closed, latch 62 similarly serves as an auxiliary safety latch preventing the compression and jamming of bag 39 within sleeve member 23 even though latch 53 may have been released by the triggering action of pneumatically operated device 250.

It is to be noted that pneumatically operated device 250 in addition to triggering rear ejector latch 63 also releases cover restrainin latch Hill by actuating lever I3I, Figs. 7, 9, l0, fulcrumed at I32.

The parallel linkage of the hose coupling assembly E5 to the cover It is most clearly shown in Fig. 6, where bell crank H5 fulcrumed at M6 to front ring 20 and at Ill to hose coupling assembly I5 forms one link of the complete parallel linkage while cover is (itself), fulcrumed at IT to front ring 28 and at M8 to hose coupling asslidably held in a groove 1 I2 by retaining screw H3 and biased upwards by spring H4. Plunger HI actuates bell crank I20 fulcrumed at I2! through one arm thereof, the other 522 of which operates switch button H9. However, although button lea may be used to start and stop the motor fan unit while the cover it is closed, the opening of cover It causes a lug 95 of parallel linkage H5 to release one leg of a Ushaped switch rocker arm 96, Figs. 8, 9 and 10, fulcrumed at 9'! and biased for clockwise rotation by spring 98. Thus when the cover is opened the other le of switch arm 95 actuates pin 99 of the on-and-off switch can to its off position, thereby stopping the motor fan unit and otherwise deenergizing the entire cleaner unit.

The electrical and pneumatic control units are closely and operatively interrelated. The pneumatic system includes a pressure differential measuring control device 29!], Fig. 11, comprising an upper casing 20! and a lower casing 292 separated by a diaphragm 2B3 pneumatically sealed therebetween. The space in the upper casing above diaphragm 203 is connected by communicating conduit 2| ll, Figs. 2 and 11, to opening 2I5, Fig. 3, on the dirty or dust collecting side of '6 the dust bag. The space in the lower casing below diaphragm 293 is connected by communicat ing conduit 22!], T-shaped coupling 22! and common conduit 225 to openin 23!], Figs. 2, 3, 4 and 9, on the clean side of the dust bag. The remaining connection from T-shaped couplin 22E com municates by means of conduit 23E with one side of valve 240 comprising valve stem 245 and valve face 242 biased to closed position by spring 2%. When valve 249 is open it communicates high suction to the interior of pneumatically operating triggering device 250, comprising a lower casing 25! pneumatically sealed by diaphragm 252 biased to distended or upward position by spring 253 and capable of actuating tripping mechanism through link member 254.

The electrical system for energizing the motor fan unit and the electrical controls are clear 1y shown in diagrammatic form in Fig. 10. Vacuum cleaner electrical cord 39d] conveys current from the house lines at 110 volts to terminal strips 39! located within the cleaner housing and from which one line 392 goes to motor 52, the other line goes to motor I2 through a circuit including line 395 on-and-off switch 359, line 9H and line m. The circuit for energizing the electrical controls comprises line 329, electromagnet 325, line 329, pneumatically operated switch 32'? of pressure differential pneumatic control unit 2629, and line 328 to the house circuit through the cleaner cord 395]. The switch 32? of pressure differential pneumatic control unit 209 comprises a biasing spring 339, Fig. 11, which serves as a conducting element and for maintaining switch 32'! normally open, together with contacts 33! and 332.

In detail and particularly with respect to the operation of the pneumatic and electrical controls, and referring especially to Figs. 10 and 11 where details of structure are clearly illustrated, the force exerted on the pressure differential diaphragm 293 progressively increases with con tinued dust collection, until it attains sufficient value to actuate switching means 32'! and complete a circuit by closing contacts 33! and 3.32 in pressure differential control unit 299, Figs. 2, 10, 11, and thereby energize electromagnet 325. The armature 359 of energized electromagnet 325 fulorumed at 35! and biased by spring 352 to hold valve 249 more securely closed, then moves down wardly and opens valve 24-0 allowing high suction to be communicated to and operate diaphragm 252 which in turn through a series of linkages 256, 255, bell crank 89, etc., releases rear latch 63, Figs. 2, i, 6 and 9, holding ejection plate 52.

Also by actuating lever I3I, Figs. 9 and 10, diaphragm 252 by way of linkage 254 trips cover releasing latch Hit, Figs. 2, 7 and 9, which latch holds cover it closed against spring tension. The release of cover It first breaks a circuit at the contact points of switch Sit through release of rocker arm 96 which is biased by spring 98 to throw switch 3m to off position, Figs. 6, 8, thereby deenergizing the motor fan unit. Thereafter the front cover continues to open and after opening substantially mechanical trigger mechanism comprising cam 94 of parallel linkage M5 trips draw bar 92 releasing front latch 32 and hence the bag ejector mechanism 5! through a previously traced series of linkages, allowing the bag ejector plate 52, Figs. 2, 4, to push the forward and throw the bag and its contained dirt out of the cleaner casing.

The ejector plate 52 moves forward and out ward when released until stops 60, Fig. 4, abut in 7 the forepartof the scissors mechanism 53. The momentum of the moving dust-filled bag causes it to continue onward in its own trajectory out of the cleaner casing after which it comes to rest on the floor.

Various other details of construction are shown in the accompanying drawings. Thus, the base plate I39, Fig. 2, sealing ,off the housing at the bottom of the dust bag and screen compartment til together with depending partitions l8! and lti forms aibag storage .chamber I85 which may also be used for storage of a cord reel. Leaf springs .160 keep the inner folded end of paper dust bag 39 from jamming under plate 52 and between the bottom edge of plate 52 and the floor of the dust bag compartment 23.

It is to be understood that the invention is not to be limited to the various structural features illustrated and described but that the sam may be variously otherwise embodied within the scope of the appended claims.

What I claim is:

1. In a vacuum cleaner, a housing defining a dust container compartment and formed with an opening for the insertion and removal therethrough of a dust container, a dust container comprising a collapsible bag portion secured to a disc portion, said bag portion having a greater length when in collapsed condition than when in expanded condition, means for supporting said disc portion from said housing adjacent to said opening, and a member extending across said compartment opposite to said opening, said member havinga portion disposed at a distance from said opening which is at least as great as the length of said bag portion when in collapsed condition and another portion which is disposed at a distance from said opening which is less than the length of said bag portion when in expanded condition.

2. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane, a dust container insertable and removable through said opening and comprising a collapsible bag portion secured to a disc portion, said bag portion having a greater length when in collapsed condition than when in xpanded condition, means for supporting said disc portion from said housing adjacent to said opening, and a vertically disposed member extending across said compartment opposite to said opening, said member having a lower portion disposed at a dstance from said opening which is at least as great as the length of said bag portion when in collapsed condition and an upper portion which is disposed at a distance from said opening which is less than the length of said bag portion when in expanded condition.

3. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane, a dust container insertable and removable through said opening and comprising a collapsible bag porton secured to a disc portion, said bag portion having a greater length when in collapsed condition than when in expanded condition, means for supporting said disc portion from said housing adjacent to said opening, and a vertically disposed member extending across said compartment opposite to said opening, said member being curved so that the upper portion thereof is substantially tangent to a vertical plane disposed at a distance from said opening which is less than the length of said bag portion when in expanded condition while .theilower portion is disposed rearwardly of said upper :portion and at a distance from said opening which is at least as great as the length of said bag portion when in collapsed condition.

4. In a vacuum cleaner, a housing defining a dust container compartment and formed with an opening for the insertion and removal therethrough of a .dust container, a dust container comprising a collapsible bag portion secured to a disc portion, said bag portion having a greater length when in collapsed condition than when in expanded condition, means for supporting saiddisc portion from said housing adjacent to said opening, a member movable through said compartment towards said opening for ejecting said container outwardly therethrough, and means for releasably retaining said member in retracted position away from said opening, said member having a first portion disposed closer to said opening than is a second portion, the distance between said first portion and said opening when said member is in retracted position being less than the length of said bag portion when in expanded condition and the distance between said second portion and said opening when said member is in retracted position being at least as great as the length of said portion when in collapsed condition.

5. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane, a dust container insertable and removable through said opening and comprising a collapsible bag portion secured to disc portion, said bag portion having a greater length when collapsed than when expanded, means for supporting said disc portion from said housing adjacent to said opening, a member movable horizontally through said compartment towards said opening for ejecting said container outwardly therethrough, and means for releasably retaining said member in retracted position away from said opening, said member having an upper portion disposed closer to said opening than is a lower portion, the distance between said upper portion and said opening when said member is in retracted position being less than the length of said bag portion when expanded and the distance between said lower portion and said opening when said member is in retracted position being at least as great as the length of said bag portion when collapsed.

6. In a vacuum cleaner, a housing defining a dust container compartment and formed with an opening for the insertion and removal therethrough of a dust container, a dust container comprising a collapsible bag portion secured to a disc portion, said bag portion having a greater length when in collapsed condition than when in expanded condition, means for supporting said disc portion from said housing adjacent to said opening, a member movable through said compartment towards said opening for ejecting said container outwardly therethrough, means for releasably retaining said member in retracted position away from said opening, said member having a first portion and a second portion, the first portion being disposed forwardly of the second portion with respect to said opening, the distance between said first portion and said opening when said member is in retracted position being less than the length of said bag portion when in expanded condition and the distance between said second portion and said opening when said member is in retracted position being at least as great as the length of said bag portion when in collapsed condition, and mechanism for moving said member disposed in part at least in the space behind said first portion.

7. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane, a dust container insertable and removable through said opening and comprising a collapsible bag portion secured to a disc portion, said bag portion having a greater length when collapsed than when expanded, means for supporting said disc portion from said housing adjacent to said opening, a member movable horizontally through said compartment towards said opening for ejecting said container outwardly therethrough, means for releasably retaining said member in retracted position away from said opening, said member having an upper portion and a lower portion, the upper portion being disposed forwardly of the lower portion with respect to said opening, the distance between said upper portion and said opening when said member is in retracted position being less than the length of said bag portion when expanded and the distance between said lower portion and said opening when said member is in retracted position being at least as great as the length of said bag portion when collapsed, and mechanism for moving said member disposed in part at least in the space behind said upper portion and above said lower portion.

8. In a vacuum cleaner, a housing defining a dust container compartment formed with an opening for the insertion and removal there through of a flexible collapsible dust container, a member movable through said compartment towards said opening for ejecting a dust container outwardly therethrough, and means for retaining said member in retracted position away from said opening, said member being formed with a recess for receiving the inner end of a newly inserted empty collapsed dust container and with a surface disposed forwardly of said recess in the direction of said opening for pressing against and supporting the inner end of the container as the latter becomes inflated.

9. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane for the insertion and removal therethrough of a flexible collapsible dust container, a member movable horizontally through said compartment towards said opening for ejecting a dust container outwardly therethrough, and means for retaining said member in retracted condition away from said opening, said member being formed with a lower recessed portion for receiving the inner end of a newly inserted empty collapsed dust container and with an upper portion having a surface forwardly of said recessed portion in the direction of said opening for contacting and supporting the inner end of the dust container as the latter becomes inflated.

10. In a vacuum cleaner, a housing defining a dust container compartment formed with an opening for the insertion and removal therethrough of a flexible collapsible dust container, and a member extending across said compartment opposite said opening, said member being formed with a recess for receiving the inner end of a newly inserted empty collapsed dust container and with a surface disposed forwardly of said recess in the direction of said opening for contacting and supporting the inner end of the container as the latter becomes inflated.

11. In a vacuum cleaner, a housing defining a dust container compartment having horizontal extent and formed with an opening disposed in a substantially vertical plane for the insertion and removal therethrough of a flexible collapsible dust container, and a member extending across said compartment opposite said opening, said member being formed with a lower recessed portion for receiving the inner end of a newly inserted empty collapsed dust container and with an upper portion having a surface disposed forwardly of said recessed portion in the direction of said opening for contacting and supporting the inner end of the dust container as the latter becomes inflated.

References Cited in the file of this patent UNITED STATES PATENTS Number 

